First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

Alberti, Matthias; Fürsich, Franz T.; Andersen, Nils

doi:10.1186/s42501-019-0048-0

Journal of Palaeogeography

Table 1 Results of the stable isotope (δ¹³C, δ¹⁸O) analyses of oysters and brachiopods from the Lower Jurassic of northern Chile. In addition to well-preserved shells, some luminescent and altered oyster shells as well as sediment and cement samples were analyzed. Please note that the high-resolution analysis of specimen CH18-006 indicated a diagenetic alteration of this shell, which has consequently not been used for further interpretations

From: First steps in reconstructing Early Jurassic sea water temperatures in the Andean Basin of northern Chile based on stable isotope analyses of oyster and brachiopod shells

Specimen no.	Taxonomy	Bed no.	Age	Ammonite zone	δ¹³C (‰ VPDB)	δ¹⁸O (‰ VPDB)	T (°C)^a
Oysters and brachiopods
CH18-026	Actinostreon solitarium	4-3	Late Toarcian	Middle to upper Levesquei	2.57	-2.46	22.3
CH18-027	Actinostreon solitarium	4-3	Late Toarcian	Middle to upper Levesquei	1.98	-2.93	24.5
CH18-013	Actinostreon solitarium	4-2	Late Toarcian	Middle to upper Levesquei	2.08	-2.60	22.9
CH18-014	Actinostreon solitarium	4-2	Late Toarcian	Middle to upper Levesquei	1.84	-3.15	25.5
CH18-006	Gryphaea sp.	6-10	Late Toarcian	Thouarsense – lower Levesquei	1.96	-4.91	(34.2)
CH18-007	Gryphaea sp.	6-10	Late Toarcian	Thouarsense – lower Levesquei	1.91	-3.52	27.3
CH18-008	Gryphaea sp.	6-10	Late Toarcian	Thouarsense – lower Levesquei	2.10	-3.69	28.1
CH18-015	Gryphaea sp.	5-7	Late Toarcian	Thouarsense – lower Levesquei	2.59	-2.46	22.3
CH18-016	Gryphaea sp.	5-7	Late Toarcian	Thouarsense – lower Levesquei	2.32	-2.76	23.7
CH18-017	Gryphaea sp.	5-7	Late Toarcian	Thouarsense – lower Levesquei	2.42	-3.19	25.7
CH18-029	Gryphaea sp.	4-1	Late Toarcian	Thouarsense – lower Levesquei	2.16	-2.81	23.9
CH18-030	Gryphaea sp.	4-1	Late Toarcian	Thouarsense – lower Levesquei	1.76	-2.79	23.8
CH18-046	Rhynchonelloidea sp.	4-1	Late Toarcian	Thouarsense – lower Levesquei	-0.05	-3.01	24.8
CH18-048	Actinostreon solitarium	4-1	Late Toarcian	Thouarsense – lower Levesquei	2.36	-2.56	22.8
CH18-002	Rudirhynchia aff. rudis	6-9	Late Pliensbachian	Spinatum	1.63	-1.85	19.6
CH18-001	Rudirhynchia aff. rudis	6-8	Late Pliensbachian	Spinatum	1.60	-3.07	25.1
CH18-032	Tetrarhynchia tetraheda	2-2	Late Pliensbachian	Margaritatus	2.01	-4.88	34.0
CH18-034	Quadratirhynchia lenticulata	2-1	Early–Late Pliensbachian	Upper Davoei – lower Margaritatus	1.48	-3.86	28.9
CH18-003	Spiriferina chilensis	5-4	Late Sinemurian	Raricostatum	0.72	-2.36	21.9
CH18-056	Gibbirhynchia curviceps	6-6	Late Sinemurian	Raricostatum	1.51	-2.31	21.6
CH18-057	Gibbirhynchia curviceps	6-6	Late Sinemurian	Raricostatum	1.25	-3.22	25.9
CH18-059	Gibbirhynchia curviceps	6-6	Late Sinemurian	Raricostatum	1.71	-3.45	26.9
CH18-037	Gibbirhynchia curviceps	5-3	Late Sinemurian	Raricostatum	1.97	-2.70	23.4
CH18-038	Gibbirhynchia curviceps	5-3	Late Sinemurian	Raricostatum	1.21	-3.14	25.4
CH18-040	Gibbirhynchia curviceps	5-3	Late Sinemurian	Raricostatum	1.48	-3.10	25.2
CH18-018	Gibbirhynchia curviceps	6-5	Late Sinemurian	Raricostatum	1.12	-3.64	27.8
CH18-019	Gibbirhynchia curviceps	6-5	Late Sinemurian	Raricostatum	1.50	-4.09	30.0
CH18-043	Quadratirhynchia crassimedia	6-5	Late Sinemurian	Raricostatum	0.97	-2.82	24.0
CH18-045	Quadratirhynchia crassimedia	6-5	Late Sinemurian	Raricostatum	1.56	-3.38	26.6
CH18-021	Quadratirhynchia crassimedia	6-3	Late Sinemurian	Raricostatum	1.55	-3.21	25.8
CH18-052	Gibbirhynchia cf. curviceps	5-2	Late Sinemurian	Raricostatum	1.43	-3.11	25.3
CH18-054	Quadratirhynchia crassimedia	5-1	Late Sinemurian	Raricostatum	1.13	-3.91	29.1
CH18-055	Quadratirhynchia crassimedia	5-1	Late Sinemurian	Raricostatum	1.35	-3.75	28.4
CH18-010	Quadratirhynchia crassimedia	6-1	Late Sinemurian	Raricostatum	1.49	-3.34	26.4
Luminescent, altered shells
CH18-023	Gryphaea tricarinata	–	Late Sinemurian	–	1.39	-14.23	(93.5)
CH18-024	Gryphaea tricarinata	–	Late Sinemurian	–	1.51	-9.13	(58.2)
CH18-025	Gryphaea tricarinata	–	Late Sinemurian	–	1.56	-8.31	(53.2)
Sediment and cement samples
CH18-006Sed	Sediment fill	6-10	Late Toarcian	Thouarsense – lower Levesquei	0.33	-8.42	(53.9)
CH18-022Sed	Sediment fill	6-2	Late Sinemurian	Raricostatum	2.02	-4.23	(30.7)
CH18-038Sed	Sediment fill	5-3	Late Sinemurian	Raricostatum	2.37	-2.85	(24.1)
CH18-056Cem	Cement fill	6-6	Late Sinemurian	Raricostatum	1.61	-10.36	(66.1)

^aTemperatures are calculated with the equation of Anderson and Arthur (1983) and a δ¹⁸O value of -1‰ VSMOW for seawater during shell formation (Shackleton and Kennett 1975)

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